// OpenHarmony LiteOS-A mem driver ported to ZENrs
// This file implements the ZENrs driver interface for the OpenHarmony mem device

const std = @import("std");
const DriverInterface = @import("driver_interface.zig").DriverInterface;
const zalloc = @import("zalloc.zig");

// Driver private data structure
pub const OpenHarmonyMemDriverData = struct {
    initialized: bool = false,
    // Add any other necessary fields here
};

// Driver interface functions

pub fn init_driver(driver_data: ?*anyopaque) bool {
    const data = @ptrCast(*OpenHarmonyMemDriverData, @alignCast(@alignOf(OpenHarmonyMemDriverData), driver_data.?));
    std.log.info("OpenHarmony mem driver: initialized", .{});
    data.initialized = true;
    return true;
}

pub fn deinit_driver(driver_data: ?*anyopaque) void {
    const data = @ptrCast(*OpenHarmonyMemDriverData, @alignCast(@alignOf(OpenHarmonyMemDriverData), driver_data.?));
    if (data.initialized) {
        std.log.info("OpenHarmony mem driver: deinitialized", .{});
        data.initialized = false;
    }
}

pub fn probe_device(driver_data: ?*anyopaque, device_info: ?*anyopaque) bool {
    _ = driver_data;
    _ = device_info;
    std.log.info("OpenHarmony mem driver: probing device", .{});
    // In a real implementation, we would check if this is a device we can handle
    return true;
}

pub fn remove_device(driver_data: ?*anyopaque, device_info: ?*anyopaque) void {
    _ = driver_data;
    _ = device_info;
    std.log.info("OpenHarmony mem driver: removing device", .{});
    // Clean up any resources associated with the device
}

// IOCTL commands for the mem driver
pub const IOCTL_MEM_MAP = 0x8001;

pub fn ioctl_device(driver_data: ?*anyopaque, device_info: ?*anyopaque, cmd: u32, arg: ?*anyopaque) isize {
    _ = driver_data;
    _ = device_info;
    
    std.log.info("OpenHarmony mem driver: ioctl cmd={x}", .{cmd});
    
    switch (cmd) {
        IOCTL_MEM_MAP => {
            // Handle memory mapping request
            // In a real implementation, we would validate the request and set up memory mapping
            std.log.info("OpenHarmony mem driver: handling memory map request", .{});
            return 0;
        },
        else => {
            std.log.warn("OpenHarmony mem driver: unknown ioctl cmd={x}", .{cmd});
            return -@as(isize, @bitCast(@as(usize, 22))); // EINVAL
        },
    }
}

// Driver interface instance
var driver_interface: DriverInterface = undefined;
var driver_data: OpenHarmonyMemDriverData = .{};

// Initialize the driver interface
pub fn openharmony_mem_driver_get_interface() *DriverInterface {
    driver_interface = .{
        .name = "openharmony_mem_driver",
        .description = "OpenHarmony LiteOS-A mem device driver",
        .version = "1.0.0",
        .init = init_driver,
        .deinit = deinit_driver,
        .probe = probe_device,
        .remove = remove_device,
        .ioctl = ioctl_device,
        .private_data = &driver_data,
    };
    return &driver_interface;
}